April 2018
Intermediate to advanced
336 pages
5h 8m
Japanese
Content preview from 実践 Deep Learning ―PythonとTensorFlowで学ぶ次世代の機械学習アルゴリズム
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.
5章畳み込みニューラルネットワーク
5.1 人間の視覚におけるニューロン
人間の視覚は信じられないほど高度です。視界の中にある複数の物を、考えたりためらったりすることなく一瞬で識別できます。対象物を特定できるだけでなく、奥行きを知覚し、輪郭を認識して、対象物と背景を区別できます。我々の眼は色のデータを含む無加工のボクセル（体積を持つピクセル）データを取り込み、脳はこのデータを加工して意味のある基本的要素（直線、曲線、形状など）を生み出します。その結果、例えば見ている対象が飼い猫だといったことがわかります†1。
[†1] Hubel, David H., and Torsten N. Wiesel. "Receptive fields and functional architecture of monkey striate cortex." The Journal of Physiology 195.1 (1968): 215-243.
人間の視覚の基本となるのがニューロンです。まず専門のニューロンが光の情報を眼から取り込みます†2。この光の情報は前処理を経て、視覚を司る脳の皮質に送られて最後に分析されます。これらの処理すべてをニューロンが一手に引き受けています。したがって、我々のニューラルネットワークを拡張すればより良いコンピュータービジョンのシステムを作れるのではと考えるのは自然なことです。この章では人間の視覚に関する知識を元に、画像処理向けの効率的なディープラーニングのモデルを作成します。まずは画像分析に関する従来のアプローチを検討し、これらの欠点を明らかにします。
[†2] Cohen, Adolph I. "Rods and Cones." Physiology of ...
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Read now
Unlock full access
More than 5,000 organizations count on O’Reilly
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.